When mixing acid and water, which procedure is correct?

When mixing acid and water, the appropriate procedure is to add acid to water. This method is correct because it allows for better control of the exothermic reaction that occurs when acids are diluted. When acid is added to water, the water can absorb the heat produced during the mixing process, reducing the risk of splashing or violent reactions that could occur if water were added to acid.

Pouring water into acid can lead to a rapid reaction, which may generate heat and cause the mixture to splash out, potentially leading to dangerous situations or injuries. Thus, the proper order ensures safety and minimizes hazards during the mixing process, making adding acid to water the best practice.

This procedure is critical for anyone handling acids in any form, ensuring adherence to safety protocols in laboratory and industrial environments.